Burners for gas cookers



c. HALFMANN ET AL 2,782,842

BURNERS FOR GAS COOKERS Feb. 26, 1957 Filed June 8, 1953 5 mm N a J w m e m w 8 W M z 5. .50 H C United States i Patent BURNERS FOR GAS COOKERS Christoph Halfmann and Heinz Aleweld, Gelsenkirchen, Germany Application June 8, 1953, Serial No. 360,176 Claims priority, application Germany September 30, 1952 6 Claims. (Cl. 158-116) Our invention relates to burners for gas cookers and has for its main object to provide a burner adapted for use with liquid gas and allowing to achieve the officially prescribed town gas standard of 1,600 kcaL/h. for normal burners, or 2,400 kcaL/h. for high capacity burners. The invention consists in increasing the total outlet crosssection for the gas feeding the heating flames, without resorting to additional devices, simply by forming vertical slots in the top edge of the burner body, so that by adjustment of the vertical extension of these slots the total outlet cross-section of the burner can be adapted to the special qualities of the liquid gas being used while incidentally the slots may be kept narrow enough to suppress any tendency of the gas lighting back.

It is a further object of our invention to provide for an additional supply of secondary air to prevent the formation of the reddish-yellow incandescent flame which is often a feature of burners fed with liquid gas.

A further object of our invention concerns the provision of means for supporting the removable top cover of the burner, whereby the cross-section for the gas outlet is still further increased and an increased intake of additional air for combustion is secured. This object is achieved by providing the top cover of the burner with cam-shaped projections to support it above the circular top face of the burner body, these projections extending only a certain distance beyond the inner edge of the top face of the burner body towards the exterior, leaving an uninterrupted annular space between the cover and the slots of the body of the burner, whereby the cross-section of the gas outlet of the burner is increased and the intake of additional air for the combustion facilitated. Another feature of our invention concerns the shape of these projections, by means of which these projections are selfacting in centring the top cover when the same is placed on the burner body.

Another feature of our invention deals with the arnangement of the vertical slots in groups and the relative circumferential positions of these groups.

An embodiment of our invention is illustrated in the for clarity of illustration), while Fig. 1 shows a side elevation with the burner in section (the left hand edge of the cover being broken away for clarity of illustrattion) while Fig. 2 is a plan view of the burner in its position within the cover plate of a gas stove, the top cover of the burner being removed to show the horizontal arrangement of the slots and their relative groupwise positions.

As illustrated in Fig. l, the body 1 of the burner with its removable top cover 2 is supplied with liquid gas from a gas pipe 12 through a regulation valve 10, 11 and a connecting tube 8. The burner is detachably secured at the front wall. 9 of the gas stove by means of hook-like structure.

The body of the burner 1 is provided with vertical slots 3 cut in the free edge, so as to form outlets for the gas. In respect to the characteristics of the liquid gas to which 2,782,842 Patented Feb. 26, 1957 'ice the burner is to be adapted, the vertical length of the slots 3 in the burner edge is adjusted while the width of each slot 3 is kept so small, for instance, less than 1 arm, that the tendency to light back is suppressed when burning liquid gases which are sluggish in ignition.

As can be seen from Fig. 2, the vertical slots 3 in the top of the burner body 1 are divided up into a number of groups, the middle slot of each group is in a radial direction, while the others run parallel to the middle slot. In this way it is arranged that the gas flame groups, burning on the outside of each group of slots, form an angle alpha through which a secondary supply of combustion air reaches each group of flames on each side, contributing to the eradication of the incandescent flame mantle which so often forms with liquid gas burners, whereby the green central cone of the flame is maintained more easily. 7

As can be seen from Fig. l, the top cover 2 is supported, with its bottom very slightly above the annular face 7, by low cam-shaped radial projections 4 resting upon the annular face 7 of the burner body 1. These radial projections 4 extend from the inner edge of the burner body 1 to a certain extent only over the top surface 7, and have sloping extensions 5 in a backwards direction, forming an angle to the inner circumferential surface of the burner tube 1 and thereby serving to allow the top cover to be automatically centred when it is placed on the top face 7 of the burner 1. As the projections 4 cover only a part of the edge face 7 of the burner body 1, a free annular space is formed above the top face 7 exterior to the projections 4, thus raising the value of the total crosssectional area of the gas outlet and encouraging the intake of supplementary air supplies for combustion of the gas issuing from the slots as a flame.

The groups of slots 3 of the burner body 1 are arranged circumferentially in relation to the projections 13 of the cover plate 14 of the gas stove so that each projection 13 is pointed towards the centre of an angular space alpha from which no flames project, with the re sult that the burning of the groups. of flames remains unimpeded by the projections 13, on which the cooking utensils to be heated are supported.

The burner which is the subject of our invention has proved particularly advantageous in the combustion of propane, which is sluggish in ignition. This type of burner can as well be used for coal gas from a municipal supply (i. e. from common city gas), the narrowness of the vertical slots prevent any lighting back of the gas.

What we claim as our invention, is:

l. A burner for gas cookers, comprising in combination, a burner body, a removable top cover for said burner body, means for supplying said burner body with gas, said burner body including a vertical tubular member having a substantially flat annular top edge, a plurality of groups of vertical slots in said top edge, the slots in each gnoup being substantially parallel to each other and the central slot in each group being substantially radial with respect to the annular top of said burner body, and spacer means provided at the underside of said cover and resting on the top edge of said body whereby to provide a space therebetween, said space and each of said slots being narrow enough to prevent any lighting back of flames formed at the exterior of said slots.

2. A burner as claimed in claim 1, wherein said removable top cover substantially covers said substantially fiat annular top edge of said vertical tubular member.

3. A gas burner having a vertical tubular member forming the burner tube, the top edge of which is a substantially flat horizontal annular surface, a plurality of groups of vertical narrow slits in the said top edge, each group being composed of several substantially parallel slits, and

the slits of each group being located at an'angle to the slits of the next adjacent group, said burner having a removable top cover substantially covering said substantially fiat annular top edge of said vertical tubular member, cam-faced projections on the bottom of said removable top cover of such a structure (as to automatically center the top cover on the inner edge of said vertical tubular member, said cam-faced projections being provided with lateral extensions projecting from the inner edge of said vertical tubular member outwardly a part only of the width of said annular surface of said top of said tubular member and having co-planar lower faces resting on said top edge, whereby an uninterrupted annular clearance is formed outside said parallelly fiaced portions of said cam-faced members.

4. A gas burner as claimed in claim 3, in which a slit located close to the center of each group of slits, is radial with respect to said annular surface.

S. A gas burner of the type shown, having a substantially vertical burner tube with means for feeding combustible gas to its lower part, the upper end of said burner tube being in the form of a substantially horiaontal annular top edge, having a plurality of groups of narrow slits therein passing entirely through the thickness of the wall of said burner tube, and extending a distance downwardly of said burner tube, each of said groups being composed to each other, and one of said group of slits near the center of said group being substantially radial with respect to said burner tube, but the; slits of any one group being at an angle to the slits of the two adjacent groups, and a cover plate supported slightly above said horizontal top edge, whereby combustible gas can issue from said slits and from the space between the cover and the top edge of said burner tube and can burn there.

6. A burner as set forth in claim 5, in which said cover carries, rigidly attached to the lower side thereof, camshaped projections adapted to center said cover on said burner tube, and spacers of a length less than the thickness of the wall of said burner tube at its top for keeping the cover raised somewhat above the top of said burner tube.

References Cited in the file of this patent UNITED STATES PATENTS France Feb. 25, 1935 

